Attachment for track drills



Jan. l1, 1927,

` M. Asci-moyen ATTACHMENT FOR TRACK DRILLS Filed Jun 15, 1926 Patented Jan. 11, 1927.

* UNITED STATES MARTIN SCHRQYER, OF BROWNSVILLE, PENNSYLVANIA.

ATTACHMENT FOR TRACK DRILLS.

Application filed June 15, 1926. Serial No. 116,239.

This invention relates to an attachment for track drills and more particularly to an attachment therefor permitting operation of the track drill by an air or electric motor.

A further object of the invention is to produce an attachment which may be readily applied to or removed from the drill, which will be efficient and durable in service. and a general improvement in the art.

These and other objects I attain by the construction shown in the accompanying drawings, wherein for the purpose of illustration is shown a preferred embodiment of my invention and wherein Figure 1 is a side elevation partially in section of a power drill attachment for hand drills constructed in accordance'with my invention, the drill being indicated in dotted lines;

Figure 2 is an end elevation `thereof;

Figure 3 is a section on the line 3 3 of Figure 1.

Referring now more particularly to the drawings, wherein the usual track drill struct-ure is illustrated in dotted lines, the numeral 10 designates the yoke of the track drill, which is usually inverted U-shaped in form and has directed through the arms 11 thereof, adjacent the bight portion 12 a rotatable shaft 13, the ends of which project beyond the outer faces of the arms. One of these ends has usually applied thereto an operating handle, not herein disclosed. Between the arms is secured a small gear 14 which, through a gear 15, drives the drill shaft 16.

In accordance with my invention, I provide a large gear 17, the hub 18 of which has directed therethrough a pin 19 for passage through the shaft 13. Opposite ends of the shaft 13 are provided-with openings 20 for the passage of this pin. Through the arms, by means of U-shaped clips 21, I secure a tube 22 paralleling the-shaft 13 and having intermediate its ends an opening 23 by means of which oil may beI introduced to the interior thereof. Rotatably fitting within the tube is a shaft 24 which is of greater length than the tube and has one end thereof formed, as at 25, for engagement in the chuck 26 of an air or electric drill. To this shaft, adjacent this end, is secured a pinion 27 for engagement with the gear 19.

It will be obvious that a device of this character may be readily attached to the drill and will transform the same from the hand to a power machine, thus materially speeding up the drilling operation, where power is available. It will be noted that the gear 17 and pinion 27 may be arranged adjacent either arm of the yoke, thus enabling reversal of the parts where this becomes necessary. The tube 22 may be 'made of suicient length to provide a long stiff bearing for the shaft 24, thus enabling this shaft to be made of very light material.

Since the construction hereinbefore set forth is obviously capable of a certain range of change. and modification without materially departing from the spirit of the invention, I do not limit myself to such specific structure except as hereinafter claimed.

I claim 1. An attachment for track drills including an inverted U-shaped yoke through the arms of which is directed an operating shaft, a gear connected intermediate the arms of the yoke with a drill shaft, said attachment comprising a gear adapted to be secured to the operating shaft, a tube adapted to be secured to the arms of the yoke in parallel relation to the operating shaft, a shaft rotatable wit-hin the tube and a pinion secured to the shaft to mesh with said gear, the end of said shaft being adapted for engagement in the chuck of a motor.

2. An attachment for track drills including van inverted U-shaped yoke through the arms of which is directed an operating sha-ft, a gear connected intermediate the arms of the yoke with a drill shaft, said attachment comprising a gear adapted to be secured to the operating shaft, a tube adapted to be secured to the arms of the yoke in parallel relation to the operating shaft, a shaft rotatable within the tube and a pinion secured to the shaft to mesh with said gear, the end of said shaft being adapted for engagement in the chuck of a motor, the last named shaft being slidable within the tube and engageablc therein from either end thereof, said gear being engageable with either end of the first named shaft.

3. An attachment for track drills including an inverted U-shaped yoke through the arms of which is directedan operating shaft, a gear connected intermediate the arms of the yoke with a drill shaft, said attachment comprising a gear adapted to be secured to the operating shaft, a tube adapted to be secured to the arms of the yoke in parallel relation to the operating shaft, a shaft rotatable Within the tube and a: pinion secured to the shaft t0 mesh with Said gear, the end of seid shaft beingadapted for engagement in the chuck of a motor, the last named shaft 5 being sldable upon the tube and engegeable therein from either end there0f,-Said gear being engageable with either end of the first named shaft, the means Securing said tube to the arms of the yoke comprising i-Shaped dips Clamping the tube to said arms. 10

In testimony whereof I hereunto aix my signature.

MARTIN SCHROYER. 

